Base station apparatus, terminal apparatus, and communication method

Abstract

A base station apparatus according to the present invention includes a transmitter configured to transmit a downlink signal by using a first component carrier and a second component carrier, and a receiver configured to receive an uplink signal transmitted by the terminal apparatus by using at least the second component carrier. The transmitter transmits spatial relation information in the uplink signal, the spatial relation information is information indicating a spatial domain transmission filter for transmitting the uplink signal, and the spatial relation information in the second component carrier includes information indicating the first component carrier.

The invention claimed is: 
     
       1. A terminal apparatus configured to communicate with a base station apparatus by using a first cell and a second cell, the terminal apparatus comprising:
 reception circuitry configured to receive a downlink signal in the first cell; and 
 transmission circuitry configured to transmit an uplink signal in the first cell, wherein:
 the reception circuitry is further configured to receive spatial relation information for the uplink signal in the first cell, the spatial relation information indicating a spatial domain transmission filter used for transmitting the uplink signal, and 
 the spatial relation information includes a cell identifier indicating the second cell. 
 
 
     
     
       2. The terminal apparatus according to  claim 1 , wherein
 the spatial relation information in the first cell further includes information indicating a bandwidth part for the second cell. 
 
     
     
       3. A base station apparatus configured to communicate with a terminal apparatus by using a first cell and a second cell, the base station apparatus comprising:
 transmission circuitry configured to transmit a downlink signal in the first cell; and 
 reception circuitry configured to receive an uplink signal in the first cell, wherein:
 the transmission circuitry is further configured to transmit spatial relation information for the uplink signal in the first cell, the spatial relation information indicating a spatial domain transmission filter used for transmitting the uplink signal, and 
 the spatial relation information includes a cell identifier indicating the second cell. 
 
 
     
     
       4. The base station apparatus according to  claim 3 , wherein
 the spatial relation information in the first cell further includes information indicating a bandwidth part for the second cell. 
 
     
     
       5. A communication method for a terminal apparatus configured to communicate with a base station apparatus by using a first cell and a second cell, the communication method comprising:
 receiving a downlink signal in the first cell; 
 transmitting an uplink signal in the first cell; and 
 receiving spatial relation information for the uplink signal in the first cell, the spatial relation information indicating a spatial domain transmission filter used for transmitting the uplink signal, wherein 
 the spatial relation information includes a cell identifier indicating the second cell. 
 
     
     
       6. A communication method for a base station apparatus configured to communicate with a terminal apparatus by using a first cell and a second cell, the communication method comprising:
 transmitting a downlink signal in the first cell; 
 receiving an uplink signal in the first cell; and 
 transmitting spatial relation information for the uplink signal in the first cell, the spatial relation information indicating a spatial domain transmission filter used for transmitting the uplink signal, wherein 
 the spatial relation information includes a cell identifier indicating the second cell.